<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>           
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 头部提示区域 -->
            <el-alert show-icon
              title="添加商品信息"
              type="info" :closable="false" center>
            </el-alert>

            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success"
            align-center>
              <el-step title="基本信息"></el-step>
              <el-step title="商品参数"></el-step>
              <el-step title="商品属性"></el-step>
              <el-step title="商品图片"></el-step>
              <el-step title="商品内容"></el-step>
              <el-step title="完成"></el-step>
            </el-steps>

            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
            label-width="100px" label-position="top">
                <!-- tab 侧栏区域 -->
                <el-tabs v-model="activeIndex" :tab-position="'left'"
                :before-leave="beforeTabLeave" @tab-click="tabClicked">
                  <el-tab-pane label="基本信息" name="0">
                      <el-form-item label="商品名称" prop="goods_name">
                          <el-input v-model="addForm.goods_name"></el-input>
                      </el-form-item>
                      <el-form-item label="商品价格" prop="goods_price">
                          <el-input v-model="addForm.goods_price" type="number"></el-input>
                      </el-form-item>
                      <el-form-item label="商品重量" prop="goods_weight">
                          <el-input v-model="addForm.goods_weight" type="number"></el-input>
                      </el-form-item>
                      <el-form-item label="商品数量" prop="goods_number">
                          <el-input v-model="addForm.goods_number" type="number"></el-input>
                      </el-form-item>
                      
                      <el-form-item label="商品分类" prop="goods_cat">
                          <el-cascader
                            expand-trigger="hover"
                            :options="catelist"
                            :props="cateProps"
                            v-model="addForm.goods_cat"
                            @change="handleChange">
                          </el-cascader>
                      </el-form-item>
                  </el-tab-pane>

                    <!-- 渲染表单的Item项 -->
                  <el-tab-pane label="商品参数" name="1">
                      <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                      :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb, i) in 
                            item.attr_vals" :key="i" border></el-checkbox>

                        </el-checkbox-group>
                      </el-form-item>
                  </el-tab-pane>
                  <el-tab-pane label="商品属性" name="2">
                      <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                      :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                      </el-form-item>
                  </el-tab-pane>

                  <el-tab-pane label="商品图片" name="3">
                      <!-- action 表示图片要上传到的后台 API 地址 -->
                      <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                      </el-upload>
                  </el-tab-pane>

                  <el-tab-pane label="商品内容" name="4">
                      <!-- 富文本编辑器组件 -->
                      <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                      <!-- 添加商品的按钮 -->
                      <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                  </el-tab-pane>
                  </el-tabs>

            </el-form>

        </el-card>

        <!-- 图片预览 -->
        <el-dialog
          title="图片预览"
          :visible.sync="previewVisible"
          width="50%">
          <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>


    </div>
</template>
<script>
import _ from 'lodash'

export default {
    data() {
        return {
            activeIndex: '0',
            //添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                //商品所属的分类数组
                goods_cat: [],
                //默认为图片的数组
                pics: [],
                //商品的详情描述
                goods_introduce: '',
                attrs: []
            },
            //添加商品的表单验证规则
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称',
                     trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格',
                     trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量',
                     trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量',
                     trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择商品数量',
                     trigger: 'blur' }
                ]
            },
            //商品分类列表
            catelist: [],
            //
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            //动态参数列表数据
            manyTableData: [],
            //静态属性列表数据
            onlyTableData: [],
            //上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            //隐藏对话框
            previewVisible: false
        }
    },
    created() {
        this.getCateList()

    },
    methods: {
        //获取所有商品的分类数据
        async getCateList() {
            const {data: res} = await this.$http.get('categories')

            if(res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据失败！')
            }
            this.catelist = res.data
            console.log(this.catelist);
        },
        // 级联选择器选中变化项，会触发这个函数
        handleChange() {   
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }

        },
        //
        beforeTabLeave(activeName, oldActiveName) {
            // console.log('即将离开的标签页名字是：' + oldActiveName)
            // console.log('即将离开的标签页名字是：' + activeName)

            if(oldActiveName === '0' &&
             this.addForm.goods_cat.length !== 3) {
                 this.$message.error('请先选择商品分类')
                 return false
             }

        },
        async tabClicked() {
            // console.log(this.activeIndex);
            //证明访问的是动态参数面板
            if(this.activeIndex === '1') {
                // console.log('动态参数面板');
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {sel: 'many'}
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }

                console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals =
                      item.attr_vals.length === 0 ? [] 
                      : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex === '2') {
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: {sel: 'only'}
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('获取静态属性失败！')
                }
                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        //处理图片预览效果
        handlePreview(file) {
            console.log(file)
            //先获取 url地址
            this.previewPath = file.response.data.url
            //
            this.previewVisible = true

        },
        //处理移除图片的操作
        handleRemove(file) {
            console.log(file);
            //1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            //2.从 pics 数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            //3.调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm);
        },
        //监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response);
            //1.先拼接得到一个图片信息对象
            const picInfo = {pic: response.data.tmp_path }
            //2.将图片信息对象，push 到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        //添加商品
        add() {
            // console.log(this.addForm)
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) {
                    return this.$message.error('请填写必要的表单项！')
                }
                //执行添加的业务逻辑
                // lodash  cloneDeep(obj)  深拷贝
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {attr_id: item.attr_id, 
                        attr_value: item.attr_vals.join(' ')
                        }
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {attr_id: item.attr_id, 
                        attr_value: item.attr_vals
                        }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)

                //发起请求添加商品
                //商品的名称必须是唯一的
                const {data: res} = await this.$http.post('goods', form)

                if(res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            if(this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>
<style lang="less" scoped>
    // 规则：上、右、下、左
    .el-checkbox {
        margin:  0 10px 0 0 !important;
    }
    .previewImg {
        width: 100%;
    }
    .btnAdd {
        margin-top: 15px;
    }
</style>